94 



Cincinnati Society of Natural History. 



4. Shaly limestone, or calcareous shale, containing 

 throughout a fauna, very much like that of the preceding 

 member. Almost a crinoidal limestone in the upper part. 

 Thickness somewhat variable, averaging perhaps ,30 feet. 

 The upper part of the Cedar Valley limestone of the Iowa 

 Geologists. 



5. A thin-bedded limestone, locally changing to a coral- 

 breccia, or a shell-breccia, always containing in profusion 

 such fossils as Acervularia davidsoni^Cy slip hy Hum americamtm, 

 Atrypa reticularis, and Spirifer parryana. Thickness about 

 10 feet. 



6. Thin-bedded limestone and greenish shale, generally 

 containing Athyris vittata in abundance. Thickness from 2 

 to 3 feet. 



7. Somewhat thick-bedded and rather soft blue limestone, 

 weathering yellow. Thickness about 5 feet. 



8. Thin-bedded limestone, with a nodular Stromatopora, 

 and with Orthoccras more or less common. Thickness about 

 2 feet. 



9. Massive and finely granular, somewhat arenaceous, 

 blue (when thoroughly weathered, brown) limestone in mas- 

 sive beds. Casts of corals and brachiopods. Thickness 

 about 10 feet. Referred to the Chemung group by Hall, to 

 the Kinderhook by Worthen, the Montpelier sandstone of 

 Calvin. 



10. A carbonaceous black seam of limestone, with a large 

 Stromatopora. Thickness seldom more than one foot. Some- 

 times absent. 



11. A hard, coral-bearing limestone, usually much changed 

 by weathering, originally bluish in color, but now mostly 

 brown, and with casts of fossils. Thickness unknown, not 

 over 10 feet. 



12. A greenish or yellow shale with brachiopods. Thick- 

 ness unknown, probably not over 5 feet. 



13. A variable, occasionally brecciated, and often much 

 weathered limestone, with corals and gasteropods. Thick- 

 ness unknown. 



The lithological character of the several beds changes 

 somewhat horizontally, but the change is never very great. 

 The appearance of the rocks in exposures is often considerably 



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